\documentclass{standalone}
\usepackage{array}
\usepackage{booktabs}
\usepackage{tabularx}
\newcolumntype{C}{>{\centering\arraybackslash}X}
\newcommand\mcbf[1]{\multicolumn{2}{c}{\textbf{#1}}}

\begin{document}
\begin{tabularx}{\linewidth}{>{\bfseries}r*{10}{C}}
	\toprule
	            & \mcbf{Labial} & \mcbf{Alveolar} & \mcbf{Palatal}
	            & \mcbf{Velar}  & \mcbf{Glottal}                                                    \\
	Nasal       & mh            & m               & nh             & n    &   &   &    &   &    &   \\
	Stop        & p             & b               & t              & d    &   &   & k  & g &    &   \\
	Sibilant    &               &                 & \multicolumn{2}{c}{s} &   &   &    &   &    &   \\
	Fricative   & f             & v               & th             & dh   & c &   &    &   & xh & x \\
	Approximant &               &                 &                &      &   & j & wh & w &    &   \\
	Lateral     &               &                 & lh             & l    &   &   &    &   &    &   \\
	Trill       &               &                 & rh             & r    &   &   &    &   &    &   \\
	\bottomrule
\end{tabularx}
\end{document}
